纳米级金属粉对GAP热分解特性的影响

Effect of nano metal powder on thermal decomposition characteristics of glycidyl azide polymer

关键词:  推进剂粘合剂  燃烧催化剂  热分解  金属催化剂  金属粉末

Key words:  Propellant binder  Combustion catalyst  Thermal decomposition  Metal catalyst  Metal powder

摘要:

用DSC和TG研究了纳米级Cu和Ni粉、超细Al粉和超细Ni粉以及普通Cu粉和Al粉对GAP (聚叠氮缩水甘油醚 )热分解特性的影响。DSC实验结果表明 :GAP/金属粉样品有两个放热峰 ,高温区的放热峰是金属的氧化峰 ,峰温受气氛影响 ,低温区放热峰是GAP的分解峰 ,不受气氛影响 ;金属Cu对GAP的分解峰影响最大 ,其中纳米级Cu (nm Cu)使GAP分解放热峰的峰值温度提前了 33 2℃ ,普通Cu粉使其提前了 12 9℃。其它几种金属粉对GAP热分解特性的影响均不明显 ;在GAP/nm Cu的样品中 ,随nm Cu含量降低 ,nm Cu对GAP热分解特性的影响程度减小 ,但并不成线性关系。TG实验结果表明 ,金属粉没有改变GAP分解的阶段性 ,但对GAP失重温度有影响。初步提出了nm Cu对GAP热分解的作用机理。

Abstract:

The effects of nano metal powders(Cu,Ni),super fine metal powders(Al,Ni) and normal metal powders(Cu,Al) on the thermal decomposition characteristics of glycidyl azide polymer (GAP)was investigated.DSC results shown that there are two exothermal peaks on DSC curve of GAP/metal powder, in which the peak at higher temperature resulted from metal reacting with oxygen is influenced by atmosphere, while the one at lower temperature resulted from GAP decomposition has no relation with atmosphere The effects of copper powder on GAP is the greatest in different metal powders The thermal decomposition peak temperature of GAP decreases 33 2 ℃ in the presence of nano copper powder, and decreases 12 9 ℃ in the presence of normal copper powder However,for other metal powders, their influences on thermal decomposition characteristics of GAP are rather small In GAP/ nano copper samples, the influence of nano copper on thermal decomposition characteristics becomes weak with the decrease of the nano copper, while there is no linear relation between nano copper and its influence degree on GAP TG results show that metal powders do not change the stage of GAP decomposition,while it influence the GAP mass loss temperature Lastly,the mechanism for the effects of namo copper on thermal decomposition characteristics of GAP is analyzed